Preheat your oven's broiler to high and move the rack to the top third of the oven.
Whisk the buffalo sauce ingredients together in a small bowl. Add the chicken in and toss until coated.
Arrange the flatbread(s) on a baking sheet or two, depending on their size. Drizzle a bit of olive oil and Frank's Red Hot sauce onto the flatbread and spread it evenly with the back of a spoon. Add the mozzarella slices. Add the shredded chicken around the mozzarella (not on top). Season with salt & pepper.
Broil for 5 minutes or until the cheese is melted, taking care not to burn the flatbread.
Meanwhile, prep the other ingredients.
Add a drizzle of Greek yogurt, the avocado, the onions, and the pea shoots. Enjoy immediately.